Eshland S 260 Rebuild

 
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lsayre
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Post by lsayre » Fri. Nov. 16, 2018 10:54 am

hotblast1357 wrote:
Fri. Nov. 16, 2018 8:45 am
Caught this just now, my downstairs radiator zone on a heat call, big delta T.

These temps are 10 degrees lower than actual, due to the probes being strapped on the black iron piping. So actual is 197/128.
A zones Delta-T can only be assessed once the system has been purged of the standing cold water within, and at least a single complete cycling of the water through the loop has occurred. What you are initially seeing is not Delta-T.

For an example of this, the Taco VT-2218 Delta-T regulated circulator runs on its highest speed for 1 minute (or was it 2 minutes?) to purge the freshly calling zone of standing water, and only after that does it make its first Delta-T inquiry.
Last edited by lsayre on Fri. Nov. 16, 2018 11:01 am, edited 2 times in total.


 
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hotblast1357
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Post by hotblast1357 » Fri. Nov. 16, 2018 10:56 am

It’s just before the zone satisfied, ran for a while.

 
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lsayre
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Post by lsayre » Fri. Nov. 16, 2018 11:00 am

hotblast1357 wrote:
Fri. Nov. 16, 2018 10:56 am
It’s just before the zone satisfied, ran for a while.
It must have a whopper load of square feet of surface area. Either that, or it is only seeing perhaps on the order of 1 GPM of flow through it. Or both...

 
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Post by hotblast1357 » Fri. Nov. 16, 2018 11:00 am

3 cast iron radiators. The circulator is on speed 1 still I think..

 
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lsayre
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Post by lsayre » Fri. Nov. 16, 2018 11:04 am

hotblast1357 wrote:
Fri. Nov. 16, 2018 11:00 am
3 cast iron radiators. The circulator is on speed 1 still I think..
The friction head must be quite high on that zone for some reason. GPM flow must be highly compromised. Something is odd here. Do you know the sum total of the sq-ft of surface area for the three cast iron radiators? Is there blockage in one or more of them from internal corrosion perhaps?

My spreadsheet places a maximum upper limit of 177 sq-ft of cast iron radiators on any single zone.

 
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Post by hotblast1357 » Fri. Nov. 16, 2018 11:12 am

confirmed circulator is on speed 1.

That loop is close to 200’ of 1/1/4 pex, four 1/1/4 90’s, two black iron manifolds that are 1/1/4” with 1” branches, then the longest radiator is on 120’ of 3/4” pex, and three 3/4” 90’s.

 
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Post by hotblast1357 » Thu. Nov. 22, 2018 7:24 am

So after watching my boiler for a couple heat calls, something I haven’t done in a while... it seems like it was just ashing every time the fan came on...
I went into the digital controller and made some adjustments and changes, watching it right now to see what it’s going to do..


 
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lsayre
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Post by lsayre » Thu. Nov. 22, 2018 7:55 am

hotblast1357 wrote:
Thu. Nov. 22, 2018 7:24 am
So after watching my boiler for a couple heat calls, something I haven’t done in a while... it seems like it was just ashing every time the fan came on...
Regardless of the PID's ashing set-point?

 
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Post by hotblast1357 » Thu. Nov. 22, 2018 8:04 am

Yes.. gonna watch it again shortly

 
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Post by hotblast1357 » Thu. Nov. 22, 2018 8:17 am

lsayre wrote:
Fri. Nov. 16, 2018 11:04 am
My spreadsheet places a maximum upper limit of 177 sq-ft of cast iron radiators on any single zone.
Here they are.

Attachments

182962B3-D6E8-4B28-91F6-5846AC655AB1.jpeg

4 tube 19” tall

938CC908-9C4F-4D59-8540-144267E6130D.jpeg

6 tube 25” tall

17F07E12-3582-4365-AEB9-CB24A61423DB.jpeg

5 tube 25” tall


 
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Post by lsayre » Thu. Nov. 22, 2018 9:15 am

On first quick look the first one is about 57 sq-ft, the second one is about 84 sq-ft, and the last one is about 76 sq-ft.

Total quick ballpark of the sq-ft = 217

About ballpark 37,000 BTUH worth of radiators if assuming 190 degree water exiting the first one, 180 degree water exiting the middle one, and 170 degree water exiting the third one, and lastly assuming 3.7 GPM flow.

But for your observed nearly 70 degrees of Delta-T your flow through these three radiators may be closer to only around 1 GPM.

 
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Post by hotblast1357 » Thu. Nov. 22, 2018 9:19 am

So idk what is going on with this controller... I have the SV at 130, and right now the PV reading 147 and the output 1 is lit up, which is telling it to ash.. all hysterisas are set at 1...

 
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Post by hotblast1357 » Thu. Nov. 22, 2018 9:41 am

lsayre wrote:
Thu. Nov. 22, 2018 9:15 am
On first quick look the first one is about 57 sq-ft, the second one is about 84 sq-ft, and the last one is about 76 sq-ft.

Total quick ballpark of the sq-ft = 217

About ballpark 37,000 BTUH worth of radiators if assuming 190 degree water exiting the first one, 180 degree water exiting the middle one, and 170 degree water exiting the third one, and lastly assuming 3.7 GPM flow.

But for your observed nearly 70 degrees of Delta-T your flow through these three radiators may be closer to only around 1 GPM.
Nope, they are not hooked in series.. they all get the same supply temp. Fed with 3/4” pex.

 
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Post by hotblast1357 » Thu. Nov. 22, 2018 9:48 am

So with the ash temp reading 147 degrees, sometimes with the set valve at 130, it wants to ash. If I bring the setting down to like 110, it shuts it off, but if I bring it way up to like 160 it doesn’t turn it on right away, then it will turn it on, then I can’t shut it off till I bring it back down to like 100-110. But sometimes if I bring it back to 130 degree setting, it doesn’t turn it on..

Maybe the controller is just bad?

Addition...

After watching some videos on YouTube, found the “derivative” setting? I turned that off. Just tried it, seems like it’s working now.. will have to watch later.

This would explain all my ash problems! Stupid thing ashing every time the fan is running.

 
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Post by hotblast1357 » Sun. Dec. 02, 2018 5:19 pm

Alright so got everything figured out. The ash motor controller was acting as a PID controller which was making it ash every time the combustion fan was coming on, some how the settings got changed, or they reset during the summer when everything was off. It’s working properly now though, Current ash temp setting is 105.

For November the auger ran 4.4 hours, 264 minutes, 6 pounds per minute, so 1584 pounds of coal.

Since 11/6 I’ve used 1066 gallons of hot water, so 930 BTU’s per gallon, 12,000 BTU’s per pound, that’s 82.6 pounds of coal for hot water for the month.

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